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NVD / CVE Program· CNA mozilla

CVE-2025-14330: JIT miscompilation in the JavaScript Engine: JIT component

CriticalCVSS 9.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 39/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.54% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: firefox (AlmaLinux:10) 140.6.0-1.el10_1; thunderbird (AlmaLinux:10) 140.6.0-1.el10_1.alma.1; firefox (AlmaLinux:8) 140.6.0-1.el8_10.alma.1.

Low priority for now. Upgrade to firefox (AlmaLinux:10) 140.6.0-1.el10_1; thunderbird (AlmaLinux:10) 140.6.0-1.el10_1.alma.1; firefox (AlmaLinux:8) 140.6.0-1.el8_10.alma.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Published
Dec 9, 2025
Updated
Oct 7, 2026
EPSS
0.5% · 46th percentile

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
9.8
CNA · mozilla
9.8
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2025-14330

When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mozillafirefox
mozillathunderbird

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Firefox

    • 140.6 and later · up to and including 140.*not affected · rpm
    • 146 and laternot affected · rpm

  • Mozilla Thunderbird

    • 140.6 and later · up to and including 140.*not affected · rpm
    • 146 and laternot affected · rpm
Affected versions · NVD (4)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla firefoxbefore 140.6.0
  • mozilla firefoxbefore 146.0
  • mozilla thunderbirdbefore 140.6.0
  • mozilla thunderbirdbefore 146.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10firefoxbefore 140.6.0-1.el10_1140.6.0-1.el10_1
AlmaLinux:10thunderbirdbefore 140.6.0-1.el10_1.alma.1140.6.0-1.el10_1.alma.1
AlmaLinux:8firefoxbefore 140.6.0-1.el8_10.alma.1140.6.0-1.el8_10.alma.1
AlmaLinux:8thunderbirdbefore 140.6.0-1.el8_10.alma.1140.6.0-1.el8_10.alma.1
AlmaLinux:9firefoxbefore 140.6.0-1.el9_7.alma.1140.6.0-1.el9_7.alma.1
AlmaLinux:9firefox-x11before 140.6.0-1.el9_7.alma.1140.6.0-1.el9_7.alma.1
AlmaLinux:9thunderbirdbefore 140.6.0-1.el9_7.alma.1140.6.0-1.el9_7.alma.1
Debian:11firefox-esrbefore 140.6.0esr-1~deb11u1140.6.0esr-1~deb11u1
Debian:11thunderbirdbefore 1:140.6.0esr-1~deb11u11:140.6.0esr-1~deb11u1
Debian:12firefox-esrbefore 140.6.0esr-1~deb12u1140.6.0esr-1~deb12u1
Debian:12thunderbirdbefore 1:140.6.0esr-1~deb12u11:140.6.0esr-1~deb12u1
Debian:13firefox-esrbefore 140.6.0esr-1~deb13u1140.6.0esr-1~deb13u1
Debian:13thunderbirdbefore 1:140.6.0esr-1~deb13u11:140.6.0esr-1~deb13u1
Debian:14firefox-esrbefore 140.6.0esr-1140.6.0esr-1
Debian:14thunderbirdbefore 1:140.6.0esr-11:140.6.0esr-1
openSUSE:Leap 15.6MozillaFirefoxbefore 140.6.0-150200.152.213.1140.6.0-150200.152.213.1
openSUSE:Leap 15.6MozillaThunderbirdbefore 140.6.0-150200.8.248.1140.6.0-150200.8.248.1
openSUSE:Leap 16.0MozillaFirefoxbefore 140.6.0-160000.1.1140.6.0-160000.1.1
openSUSE:Leap 16.0MozillaThunderbirdbefore 140.6.0-bp160.1.1140.6.0-bp160.1.1
openSUSE:Tumbleweedfirefox-esrbefore 140.6.0-1.1140.6.0-1.1
openSUSE:TumbleweedMozillaFirefoxbefore 146.0-1.1146.0-1.1
openSUSE:TumbleweedMozillaThunderbirdbefore 140.6.0-1.1140.6.0-1.1
Red Hat:enterprise_linux_eus:10.0firefoxbefore 0:140.6.0-1.el10_00:140.6.0-1.el10_0
Red Hat:enterprise_linux_eus:10.0firefox-debuginfobefore 0:140.6.0-1.el10_00:140.6.0-1.el10_0

+86

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x…KEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the…KEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to…KEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2025-14328Dec 9, 2025 · Privilege escalation in the Netmonitor component
    35Monitor
  • ← EarlierCVE-2025-14329Dec 9, 2025 · Privilege escalation in the Netmonitor component
    35Monitor
  • Later →CVE-2025-14331Dec 9, 2025 · Same-origin policy bypass in the Request Handling component
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:firefox140.6.0-1.el9_7.alma.1 · AlmaLinux:9Package registry (OSV)
almalinux:firefox-x11140.6.0-1.el9_7.alma.1 · AlmaLinux:9Package registry (OSV)
almalinux:thunderbird140.6.0-1.el9_7.alma.1 · AlmaLinux:9Package registry (OSV)
debian:firefox-esr140.6.0esr-1~deb12u1 · Debian:12Package registry (OSV)
debian:thunderbird1:140.6.0esr-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:firefox-esr140.6.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:MozillaFirefox140.6.0-150200.152.213.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:MozillaThunderbird140.6.0-150200.8.248.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:firefox0:140.6.0-1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:firefox-debuginfo0:140.6.0-1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:firefox-debugsource0:140.6.0-1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:firefox-x110:140.6.0-1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird0:140.6.0-1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird-debuginfo0:140.6.0-1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:thunderbird-debugsource0:140.6.0-1.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
rocky linux:firefox0:140.6.0-1.el9_7 · Rocky Linux:9Package registry (OSV)
rocky linux:thunderbird0:140.6.0-1.el9_7 · Rocky Linux:9Package registry (OSV)
suse:MozillaFirefox140.6.0-112.292.1 · SUSE:Linux Enterprise Server 12 SP5-LTSSPackage registry (OSV)
suse:MozillaFirefox140.6.0-150200.152.213.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP6Package registry (OSV)
suse:MozillaThunderbird140.6.0-150200.8.248.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP6Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-277677 days apartSandbox escape due to incorrect boundary conditions in the Telemetry component in External Software
    40Plan
  • CVE-2026-277877 days apartSandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component
    40Plan
  • CVE-2026-16367224 days apartSandbox escape due to invalid pointer in the Disability Access APIs component
    40Plan
  • CVE-2026-087935 days apartSandbox escape due to incorrect boundary conditions in the Graphics component
    39Monitor
  • CVE-2026-089235 days apartMemory safety bugs fixed in Firefox 147 and Thunderbird 147
    39Monitor
  • CVE-2025-1172156 days apartMemory safety bug fixed in Firefox 144 and Thunderbird 144
    39Monitor

Not on record for this CVE: EPSS history · patch commit or PR link · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records